Steam intake sleeve for sulphite pulp digesters



July 26, 1932. E MORTER UD 1,869,270

STEAM INTAKE SLEEVE FOR SULPHITE PULP DIGESTERS Filed Oct. 20, 1931Ivy/(w for: E jfarferyd,

Patented July 26, 1932 EINAR MORTERUD,

or item; inonwnxl I STEAM INTAKE SLEEVE non siiLr intrn' r trrniessmnsApplication filed October 20, 1931, Serial No.

The present invention relates to sulphite pulp digesters ot the kind inwhich steam for the purpose of heating the liquor is introduced into thedigester.

It has been found that the steam intake sleeve by means of which thesteam is passed from the outside to the digester shell and digesterlining, is liable to cause leakage in the brick lining of the digester,and particularly this is the case when acid proof steel is used forsteam tube'and sleeve, as this material has a very high coeflicient ofheat expansion.

In accordance with the present invention this drawback is avoided byconnecting the steam intake sleeve with the digester shell by means of asurrounding auxiliary sleeve,

which is tightly connected with the exterior of the digester shell andwhich extends right through the interior brick lining of the digester soas to form a support for the brick lining.

The said exterior sleeve is connected with the steam intake sleeve onlyat the exterior 5 end of the latter, the two sleeves being otherwiseseparated by means of an annular space, which at its inner end is infree communication with the interior end of the digester and whichextends outwards as far as to the shell of the digester.

The exterior shell which forms the support for the brick lining willaccordingly not be exposed to the high temperature of the steam, butonly to the temperature of the liquor in the interior of the digester,and the steam intake sleeve which is exposed to the high temperature ofthe steam is permitted to expand freely without transmitting stresses tothe brick lining.

If necessary, means may be provided for establishing a circulation ofliquor in the annular space between the steam intake sleeve I and thesurrounding sleeve, so as to prevent overheating and/or evaporation ofthe liquor between said sleeves, and the forming of crusts.

Two forms of the invention are diagrammatically illustrated on thedrawing.

Fig. 1 is an axial section through a simple steam intake sleeve, andFig. 2 illustrates a sseleeejaiiem may novei i'b'i 193939;

steam intake sleeve for supplying steam to a circulation conduit in theinterior of the digester.

1 is the, digester shell and 2 the brick lining. On the exterior surfaceof thedigester shell there is located an annular supporting 7 disk 3,against which is placed the exterior,

sleeve 4, which extends inwards through the brick lining, and theexterior flange 5 of which lies against annular disk3. i The steamintake sleeve 6 with its exte-, rior flange 7 and a short shoulder 8 ispressed tightly against the flange 5 of exterior sleeve 4. V q

The remaining part of steam intake sleeve 6 6 is separated from-exteriorsleeve 4 by an annular space 9, which is in directcommunication with theinterior of the digester and which is accordingly filled with digesterli- T quor, which forms a heat insulatinglayer between sleeves 4 and 6.In order to provide circulation of the liquor in space 9, suitable meanssuch as ribs or channels may be provided in order to secure a continuousmovement of liquor in space 9 by thermosi- 76 phon action.

According to the form of the invention illustrated on Fig. 2 there islocated between exterior sleeve 4 and steam intake sleeve 6 a furthersleeve 10, to the inner end ofwhichf' is secured a tube 11 through whichliquor is circulated in the interior of the digester. The annular space12 between sleeves l0 and t is in direct communication with the interiorof the digester, whereas the space 9 between intake sleeve 6 andintermediate sleeve 10 is in direct communication with the interior ofthe circulation pipe 11.

In this manner there is provided'a doubl layer ofheat insulating liquorbetween the steam intake sleeve 6 and the exterior sleeve 4 supportingthe brick lining. i

I claim: a g Improvement in steam intake sleeves for passing steamthrough the wall of'a sulphite pulp digester or the like provided withinterior brick lining, characterized by that the steam intake sleeve issurrounded by an auxiliary sleeve, passing from the exterior surface ofthe digester'shell through the bricklining thereof and serving as asupport for the brick lining, the steam intake sleeve proper and theauxiliary sleeve being separated by means of an annular space, which isin direct communication with the interior of the digester and whichextends outwards the two sleeVesa-rein direct heat transmit inlet tube.V

at least as far as to the. digester shell, so that,

ting conneotio-n with each other-only at their exterior ends, with theobject of preventing i i I stresses being transmitted. to the brick lin-LI I at e p n on of the Ste ing owing to the he In testimony. whereoname to this'specification.

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